Hi,
I'm a newbie developing for PocketPC. Can anyone point me how to start developing a video recorder using the built-in camera on a XDA-III? I also need to have access to individual frames to perform some image interpretation such as motion detection. Any help is usefull. I use Visual Studio 2003
Thank you,
Miguel
the easy way would be to get some code as to how it's don on pc because
how you access frames from the streams are the same if you use a pda or pc
the files are still mp4 or avi or ...... what you set them to
if you grab and then work with the ripped file
if you want to do it real time you face 2 issues
1 the camera API is not public from HTC
2 the cpu's in pda's even though they are fast Mhz are much much slower then even pc cpu's of the same speed so real time checking the stream could be impossible
Hi Rudegar,
Thanks for the reply! On the PC i usually use a wrap library for DirectShow i don't think it's available for the PocketPC. Do you know where i can get the camera API?
did a search in this foruk for camera api and here are some hits i got
http://forum.xda-developers.com/viewtopic.php?t=4950&highlight=camera+api
http://forum.xda-developers.com/viewtopic.php?t=12046&highlight=camera+api
http://forum.xda-developers.com/viewtopic.php?t=11726&highlight=camera+api
http://forum.xda-developers.com/viewtopic.php?t=11200&highlight=camera+api
http://forum.xda-developers.com/viewtopic.php?t=11095&highlight=camera+api
http://forum.xda-developers.com/viewtopic.php?t=10172&highlight=camera+api
Wince50 provide some directshow api ... can you suggest some tutorials ?
is there a reg hack or program like coolcamera that work on trinty i want to record video on 640:480
my friend have imate jam that record video with 640:480 20FPS
i know trinity can record "cif" with 30FPS.
(COOLCAMERA NOT WORKING ON TRINITY!)
Coolcamera works on my Trinity, though I've not tried the video features.
the image function working but i have the HTC CAMERA program for that
if i have video 640:480 20FPS i wont need to buy camcorder
coolcamera record video on 640:480 with 2FPS like 320:240
but the original htc camera program record on 320:240 with 30FPS
Hi ! Is there a way to record video at 320x240 with the Prophet ? (my unit is the S200). Possibly by using software or something ? (normally the max resolution for video recording on the S200 is 176x144, which is kind of strange considering that S100 and other HTC/Qtek even older models are capable of recording at 320x240 resolution)
Many thanks.
anybody ?
Coolcamera can switch resolution up to 640x480.
Unfortunately the framerate drops to 10fps @320 and 4fps @640 what is not so great.
I am wondering also why other devices are so much better with video..maybe therer is a different solution out there using also the Intel graphicsprozessor onboard.
If anybody has a better solution i am interested in it also.
there was a bug once
before i upgraded ROM it showed 320x240 video resolution option but did record in the small (140x80 or sth). After upgrading I thought they would fix it but instead they just removed the option!!
are new's about de SW to use a 320x240 video resolution ??
use CoolCamera, you can use 320x240 but the framerate will probably be low. I found that framerate depends especially on SD card speed. So the SD card is the bottleneck. If you use hi-speed SD card framerate should be accetable. Good ligting is also very important
I am sure anyone who has had experience of it will agree slingplayer is one of the best applications for a pocket pc.
However on the Ameo, which is the variant I have, its performance is a lot to be desired. Whether I use it on the wifi or HSDPA it seems to be jerky all the time (not a very good user experience). The stats say the 300kb/s to 400kb/s is being achieved but the frame rate doesn’t go much above 10 (is it the darn video driver again?). The settings i use are:
Enable slingstream optimization
High action
video resolution : 320 by 240
audio : mono low
Managed to borrow a dell Axim X51 (qVGA screen, 412Mhz version) the other day, and tested its slingplayer performance and frankly was amazed at the difference. It was managing 30 frames per second and was super smooth whether portrait or landscape (same slingplayer settings by the way).
Ameo has the same processor as the Dell only faster, different graphics chip though.
Is it because Dell has a proper video driver or the fact that it is only a qVGA resolution i.e. 4 times less area to display. You will note that best performing devices as far as SPB graphics benchmark are qVGA.
I have read on threads people being pretty happy with slingplayer performance but that’s a subjective statement.
Could people who have used slingplayer on any variant of the athena, i.e. advantage X7500, X7501, dopod 1000 etc. state the frame rate and the bandwidth they are achieving (either cellular or wifi connection) so we can narrow down the problem.
1) Lack of proper ATI driver on all or some of the athena variants.
2) VGA screen taxing the processor too much (shouldn't be as the slingplayer application is still trying to display qVGA resolution, assuming 4 pixels displaying the same image is less strenuous on the processor than displaying 4 distinct images)
3) Some other reason such as splingplayer not optimized for the ATI chip?
Any feedback will be greatly appreciated
I tried this last night and I am getting 10-15fps whether connected to my wi-fi network or via 3G and my vid is jerky as well. Disappointing but hopefully will get better... I am using the default settings (slingstream optimization and medium action).
EDIT: FWIW, the Axim x51v is VGA 640x480...
EDIT2: My bandwidth is 200-300kbps whether connected to wi-fi or 3G.
assuming you guys are using win media player to play the videos, you are probably running into the same issues I had trying to stream from ORB to my ameo, the fix was to use the windows mobile 5 (windows media video 9) codecs for windows media player ! simply unpack the attached files and copy into your windows folder then reboot.
apperntly there is an issue with the Windows media video 10 codecs supplied with win mobile 6 !
ice_coffee said:
assuming you guys are using win media player to play the videos, you are probably running into the same issues I had trying to stream from ORB to my ameo, the fix was to use the windows mobile 5 (windows media video 9) codecs for windows media player ! simply unpack the attached files and copy into your windows folder then reboot.
apperntly there is an issue with the Windows media video 10 codecs supplied with win mobile 6 !
Click to expand...
Click to collapse
The slingplayer mobile application is self contained (no WMP involved) and plays live streaming video only...
same problem here
billu said:
1) Lack of proper ATI driver on all or some of the athena variants.
2) VGA screen taxing the processor too much (shouldn't be as the slingplayer application is still trying to display qVGA resolution, assuming 4 pixels displaying the same image is less strenuous on the processor than displaying 4 distinct images)
3) Some other reason such as splingplayer not optimized for the ATI chip?
Any feedback will be greatly appreciated
Click to expand...
Click to collapse
The reason is that SlingMobile is using DirectDraw. The DDraw API on WM is slooooow. Thats the reason players like PocketTV or TCPMP went out of their way to code driver support for GPUs
The X7501 def has the ATI Imageon drivers there (I pointed this out on another thread), but it doesnt matter much. DDRaw+ATI=slow. DDRaw+Intel 2700=not TOO bad (hence the X51V working)
Basically, every PPC ever made from the Axim X51V forward should have had the Intel 2700. That they didnt has crippled the platform when it comes to video. The Imageon has potential, but ATI seems very hard to work with and getting it optimized is NOT easy.
The Marvell may save this situation if devs can start to take full advantage of WMMX2. Early reports show that with straight DDRaw, the Marvell proc alone is STILL not up to Intel 2700 standards, but Id bet that with direct WMMX2 enhanced code, it would be.
you can increase the buffer, but you have to do it in the registry, once you change it you cant go back into settings and change anything without changing the buffer back to 4 seconds
hklm\software\sling media\slingplayer\player
precharge duration = 10000
the 10000 in milliseconds
Thanks for the comments.
So it seems that the only hope is if an update of the slingplayer software decides to use the ATI Imageon driver.
Just to clear something up, the Dell I used was a X51 (320 by 240) and NOT a X51V (which is 640 by 480)
Is it possible to get the slingplayer to use the ATI driver using a registry tweak??
I would assume if they had developed ATI support they'd expose it. It may be possible that there is some undocumented dedicated support for the Imageon, but I havent seen anything.
I have just got my slingbox this week and I liked the idea of been able to watch my sky+ recordings, but playback via 3g is watchable but only about 15 fps , there is no improvement using wifi? However my cctv camera works smooth and looks great- possibly becouse its a black and white camera?
As a previous poster said orb works very good playing back full size divx from my home pc via either wmp or tcpmp without problems over 3g? but orb requires the pc to be on all the time, which is why I got the slingbox.
I just hope someone with more skill and knowlage than myself can sort a solution
Sling has released a new version of their mobile player that uses GDI instead of DirectDraw. Has anyone tried this on their Athena to see if it improves performance?
citivolus said:
Sling has released a new version of their mobile player that uses GDI instead of DirectDraw. Has anyone tried this on their Athena to see if it improves performance?
Click to expand...
Click to collapse
I tried GDI but the frame rate dropped off significantly.
There are 3 major problems with SlingPlayer on the Athena. As said before, it does not use the ATI video driver. But also the maximum supported resolution is only 320x240 and the maximum bit rate is only 600kbs. So it's never going to look as good as TCPMP for example.
The best setting to change to make SlingPlayer watchable is to specifically set the video bit rate to 600kbs. Unless this is done, the SlingPlayer never seems to use more than 300kbs and the result is very poor video. With 600kbs bit rate and 320x240 resolution, I get about 15fps on average. If I drop the resolution to 224x176 I get nearly 30fps.
My Slingbox video stream is 77kbs
I hope any body can help me with this issue.
I have my slingbox set in NY,USA, and I'm now in Bahrain my internet provider speed is 2mbs download/ 512 kbs, and the internet provider in NY is verizon at 6mbs/ 760kbs upload.
However, every time I start my sling box on my laptop (Dell D610), the video optimization start at 600-700 kbs and end up in 2 min in 77 kbs and stop there.
I don't know, if this is something has to do with the setup or what exactly...?
Can any body help me with that??
Thanks
Are you saying you have a problem using your slingbox on your Athena or your laptop? If your laptop then you are posting in the wrong place!
anyone figure out the optimal settings for our athena's to get buffering/playback more manageable?
Hi,
I developed and app for win.mob.6 for video capture live streaming using direct show filter. WMV9 encoder has very low performance of framerate no more 4 fps with lower res.
I am testing the app on HTC touch dual. I tried to enum all filters availables, but I found only WMV9 Encoder. The original app cam coder can create 3gp file with h263+amr-nb. I'd like to know how is possibile this !!! no h263 filter encoder are available.
I am looking for an htc WM5/6 model that can capture video frames encoded to 15 fps with a mid res 170x140.
help please.
thanks
Hi fala70,
I am sorry but I couldnt quite understand what it is your current status.
Have you developed the application and it is working or you would like to do it now?
What do you mean 'original' application. Are you based on an open source example or something?
Nice subject though!
This issue has been discussed quite a number of times (I asked the same thing a few months ago) but no resolution as come out so far. I think HTC does not allow its "private" encoders to be "enumerated".
My status it that I want understand if is possible to use an other codec encoder different from WMV9. WmV9 is too slow.
HTC-Master said:
Hi fala70,
I am sorry but I couldnt quite understand what it is your current status.
Have you developed the application and it is working or you would like to do it now?
What do you mean 'original' application. Are you based on an open source example or something?
Nice subject though!
Click to expand...
Click to collapse